NMatrix

[translunar]

Right now, timeseries doesn't use NMatrix. Depending on ruby-core's matrix.rb makes it slow. We should switch to NMatrix, especially now that NMatrix includes SVD functionality.

[agarie]

This should be moved to statsample! And yes, we need to talk about using NMatrix in statsample, minimization, integration (where applicable).

[translunar]

Why should it be moved to statsample? Oh, because statsample also fails to use NMatrix. Got it.

[v0dro]

Wont that cause dropping compatibility jruby or rubinius?